VO2 Max Calculator

Estimate your aerobic fitness (VO2 max) from resting heart rate or a Cooper run test, and see how you rate for your age and sex.

Estimate Your VO2 Max

Estimation Method

Age (years)

Sex

Resting Heart Rate (bpm)

Estimated VO2 Max

—

ml/kg/min

Fitness rating—

Age group—

“Good” threshold—

“Excellent” threshold—

Your VO2 Max vs Age-Group Benchmarks

What VO2 Max Measures

VO2 max is the maximum volume of oxygen your body can use per minute during intense exercise, expressed in millilitres per kilogram of body weight per minute (ml/kg/min). It's the single best lab measure of aerobic fitness, and higher values are consistently linked with better endurance and lower all-cause mortality. A true VO2 max needs lab equipment — this calculator estimates it from simpler inputs.

Two Ways to Estimate It

The resting heart rate method uses the ratio of your maximum to resting heart rate (VO2 max ≈ 15.3 × MHR ÷ RHR), which works because a lower resting pulse reflects a stronger, more efficient heart. The Cooper 12-minute run test estimates VO2 max from how far you can run in 12 minutes — more effort, but often more accurate for trained people.

Tip: For the resting-HR method, take your pulse first thing in the morning before getting up, across a few days, and use the average for the most reliable estimate.

Reading Your Rating

VO2 max naturally declines with age and runs lower in women on average, so ratings are compared within your age and sex group rather than against one universal number. Endurance training is the most effective way to raise it — particularly interval work near your max effort, balanced with steady aerobic base miles.

Frequently Asked Questions

What is a good VO2 max?

It depends on age and sex. For a man in his 30s, roughly 42–47 ml/kg/min is 'good' and above ~48 is excellent; women run several points lower. Elite endurance athletes often exceed 60.

How is VO2 max estimated without a lab?

Common field methods include the resting heart rate ratio (15.3 × max HR ÷ resting HR) and the Cooper 12-minute run test, which estimates VO2 max from distance covered. Both approximate a true lab measurement.

How accurate is the resting heart rate method?

It's a reasonable ballpark that captures your general fitness level, but it can be off by several points. Field running tests like the Cooper test tend to be more accurate for trained individuals.

How can I improve my VO2 max?

Regular aerobic training raises VO2 max, especially interval training performed near your maximum effort combined with a solid base of steady endurance work. Improvements of 5–15% over a few months are realistic for many people.

Does VO2 max decline with age?

Yes. VO2 max typically peaks in the 20s and declines gradually with age, though staying active dramatically slows the drop. That's why ratings are compared within your own age group.